Problems of stone mastic asphalt use in north Queensland

Allen, Glen Keith (2006) Problems of stone mastic asphalt use in north Queensland. [USQ Project] (Unpublished)


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Stone Mastic Asphalt (SMA) is widely used throughout the world as one of the
preferred asphalt surfacings. The history of use of this material dates back some 30
years ago, and like every product stone mastic asphalt needs to be modified and adapted
to conform modern materials and manufacture, as well as suit the various local
conditions. This dissertation develops and analyses the variances in all properties of
SMA within a tropical climate. The aim is to provide background information into the
history of the product and the current best practice, before moving into the
specifications and requirements of the North Queensland region. The methodology will
take the format of the testing of trial sections, analysing data and results, compiling
details and collating information within the prioritized sections. The aim is to make
definite correlations between specific criteria and then hypothesis on the possibilities.
The outcome is the actual design criteria that leads to particular properties and arrive at
the failure mechanisms of stone mastic asphalt. The applicability of this paper will be a
document which aligns with the Government Standards for Asphalt design to either
reinforce or alter current practices.
The impacts of filler and binder components of the mastic are assessed on the
performance of SMA. The paper develops a design method to ensure that the important
features of the coarse aggregate stone skeleton are attained, providing a rut resistant
long life asphalt. Analysis is provides in the combining of criteria on rut resistance and
fatigue performance to arrive at a mix design shows good strength, texture and stability
for use in surfacing works with heavy traffic condition. Elastic and fatigue properties
are assessed by analyzing the affects of fillers, binders and temperature and the
relationship between stiffness and fatigue.
SMA is an unforgiving mix and requires changes and modifications to the mix design to
enhance the characteristics of its performance. This is evident through the varying
specifications across the State, and the North Queensland developments form a major
topic within the report. Whilst SMA a premium asphalt product it is not a panacea for
all pavement situations. Its use and specification requires exercising sound engineering
judgment. This research will provide a rational basis for such judgment.

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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 11 Oct 2007 01:04
Last Modified: 02 Jul 2013 22:44
Uncontrolled Keywords: stone mastic asphalt (SMA); polymer; transport; Queensland
Fields of Research (FoR): 09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering

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